geforce5700le refresh rates

Under Windows XP Sp2 I use a resolution of 1152x864 and 85Hz Refresh Rate. Under Vista Beta 2, I am unable to 'force' a refresh rate, it seems everything from 800x600 to as high as my monitor supports, will default to 85Hz, but 1152x864 will not. My monitor supports the setting, I use it under XP, but sadly my Monitor, a Mitsubishi DiamontPro 930SB is not detected under Vista, it shows up as a PNP Monitor, and the drivers, NaviSet, don't support vista yet. How can I force it to 85Hz?
Sorry for all the questions. :)

NM, had to go to advanced and list all modes and force it.
"MatthewH12" wrote:

Under Windows XP Sp2 I use a resolution of 1152x864 and 85Hz Refresh Rate. Under Vista Beta 2, I am unable to 'force' a refresh rate, it seems everything from 800x600 to as high as my monitor supports, will default to 85Hz, but 1152x864 will not. My monitor supports the setting, I use it under XP, but sadly my Monitor, a Mitsubishi DiamontPro 930SB is not detected under Vista, it shows up as a PNP Monitor, and the drivers, NaviSet, don't support vista yet. How can I force it to 85Hz?
Sorry for all the questions. :)